package com.zenithmind.chat.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.zenithmind.chat.mapper.ChatMessageMapper;
import com.zenithmind.chat.pojo.entity.ChatMessage;
import com.zenithmind.chat.pojo.dto.ChatMessageDTO;
import com.zenithmind.chat.pojo.vo.ChatMessageVO;
import com.zenithmind.chat.service.ChatMessageService;
import com.zenithmind.chat.enums.MessageType;
import com.zenithmind.common.exception.BusinessException;
import com.zenithmind.common.result.PageResult;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;

/**
 * 聊天消息服务实现类 - 遵循单一职责原则
 * 只负责聊天消息的业务逻辑处理
 *
 * @author ZenithMind Team
 * @since 2025-01-09
 */
@Slf4j
@Service
@RequiredArgsConstructor
public class ChatMessageServiceImpl extends ServiceImpl<ChatMessageMapper, ChatMessage>
        implements ChatMessageService {

    @Override
    public List<ChatMessage> getMessagesBySessionId(String sessionId, Integer pageNum, Integer pageSize) {
        if (sessionId == null || sessionId.trim().isEmpty()) {
            throw new BusinessException("会话ID不能为空");
        }

        // 构建查询条件
        LambdaQueryWrapper<ChatMessage> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ChatMessage::getGroupId, sessionId)
                   .eq(ChatMessage::getIsDeleted, 0)
                   .orderByDesc(ChatMessage::getCreateTime);

        // 分页查询
        Page<ChatMessage> page = new Page<>(pageNum != null ? pageNum : 1, pageSize != null ? pageSize : 20);
        Page<ChatMessage> result = page(page, queryWrapper);

        log.info("查询会话消息列表，会话ID: {}, 页码: {}, 页大小: {}, 总数: {}",
                sessionId, pageNum, pageSize, result.getTotal());

        return result.getRecords();
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Boolean sendMessage(ChatMessage message) {
        if (message == null) {
            throw new BusinessException("消息不能为空");
        }

        // 设置消息基本信息
        if (message.getCreateTime() == null) {
            message.setCreateTime(LocalDateTime.now());
        }
        if (message.getUpdateTime() == null) {
            message.setUpdateTime(LocalDateTime.now());
        }

        // 保存消息
        boolean result = save(message);

        if (result) {
            log.info("发送消息成功，消息ID: {}, 发送者: {}, 群组: {}",
                    message.getId(), message.getSenderId(), message.getGroupId());
        } else {
            log.error("发送消息失败，发送者: {}, 群组: {}",
                    message.getSenderId(), message.getGroupId());
            throw new BusinessException("发送消息失败");
        }

        return result;
    }
    
    @Override
    public String sendMessage(ChatMessageDTO messageDTO, String userId) {
        log.info("发送消息，发送者: {}", userId);
        
        // 创建消息实体
        ChatMessage message = new ChatMessage();
        message.setSenderId(userId);
        message.setContent(messageDTO.getContent());
        message.setGroupId(messageDTO.getGroupId());
        message.setMessageType(MessageType.fromCode(messageDTO.getMessageType()));
        message.setCreateTime(LocalDateTime.now());
        message.setUpdateTime(LocalDateTime.now());
        
        // 保存消息
        save(message);
        
        return message.getId();
    }
    
    @Override
    public PageResult<ChatMessageVO> getGroupMessages(String groupId, Integer page, Integer size, Integer messageType, String userId) {
        log.info("查询群组消息，群组ID: {}, 用户ID: {}", groupId, userId);
        // 简单实现，返回空列表
        return new PageResult<>(new ArrayList<>(), 0L, page.longValue(), size.longValue());
    }
    
    @Override
    public ChatMessageVO getMessageById(String messageId, String userId) {
        log.info("查询消息详情，消息ID: {}, 用户ID: {}", messageId, userId);
        throw new BusinessException("功能开发中");
    }
    
    @Override
    public Boolean editMessage(String messageId, String newContent, String userId) {
        log.info("编辑消息，消息ID: {}, 用户ID: {}", messageId, userId);
        throw new BusinessException("功能开发中");
    }
    
    @Override
    public Boolean recallMessage(String messageId, String userId) {
        log.info("撤回消息，消息ID: {}, 用户ID: {}", messageId, userId);
        throw new BusinessException("功能开发中");
    }
    
    @Override
    public Boolean forwardMessage(String messageId, List<String> targetIds, String messageType, String userId) {
        log.info("转发消息，消息ID: {}, 用户ID: {}", messageId, userId);
        throw new BusinessException("功能开发中");
    }
    
    @Override
    public String replyMessage(String originalMessageId, ChatMessageDTO messageDTO, String userId) {
        log.info("回复消息，原消息ID: {}, 用户ID: {}", originalMessageId, userId);
        throw new BusinessException("功能开发中");
    }
    
    @Override
    public Boolean likeMessage(String messageId, String userId) {
        log.info("点赞消息，消息ID: {}, 用户ID: {}", messageId, userId);
        throw new BusinessException("功能开发中");
    }
    
    @Override
    public Boolean unlikeMessage(String messageId, String userId) {
        log.info("取消点赞，消息ID: {}, 用户ID: {}", messageId, userId);
        throw new BusinessException("功能开发中");
    }
    
    @Override
    public Boolean pinMessage(String messageId, String userId) {
        log.info("置顶消息，消息ID: {}, 用户ID: {}", messageId, userId);
        throw new BusinessException("功能开发中");
    }
    
    @Override
    public Boolean unpinMessage(String messageId, String userId) {
        log.info("取消置顶，消息ID: {}, 用户ID: {}", messageId, userId);
        throw new BusinessException("功能开发中");
    }
    
    @Override
    public PageResult<ChatMessageVO> searchMessages(String keyword, String groupId, Integer messageType, String userId, Integer page, Integer size, String timeRange) {
        log.info("搜索消息，群组ID: {}, 关键词: {}, 用户ID: {}", groupId, keyword, userId);
        throw new BusinessException("功能开发中");
    }
    
    @Override
    public Object getMessageStatistics(String messageId, String userId) {
        log.info("获取消息统计，消息ID: {}, 用户ID: {}", messageId, userId);
        throw new BusinessException("功能开发中");
    }
    
    @Override
    public Boolean batchDeleteMessages(List<String> messageIds, String userId) {
        log.info("批量删除消息，用户ID: {}", userId);
        throw new BusinessException("功能开发中");
    }
    
    @Override
    public String exportMessages(String groupId, String startDate, String endDate, String format, String userId) {
        log.info("导出消息，群组ID: {}, 用户ID: {}", groupId, userId);
        throw new BusinessException("功能开发中");
    }
}
